Machine for making spirals



- June 11, 1946. w. F. H. BRAUN MACHINE FOR MAKING SPIRALS Filed July21, 1944 2 Sheets-Sheet 1 W/TA ESS':

June 11, 1946. w" H BRAUN 2,401,720

MACHINE FOR MAKING SPIRALS Filed July 21, 1944 2 Sheets-Sheet 2 w awmlwr/vsss: Z 207: firaaiz mm-41 Y Jrrwwm-X .shown in Fig. 4;

- eter.

Patented June 11, 1946 UNITED STATES PATENT OFFICE.

FOR MAKING SPIRALS William F. H. Braun, Wynnewood, Pa. Application July21, 1944, Serial No. 545,995 3 Claims. (Cl. 153-54) The principal objectof the present invention is to provide a simple, reliable and efllcientmachine for making spirals, for example cutters, for lawn mowers and forother purposes.

Other objects of the invention will appear from the followingdescription at the end of which the invention will be claimed.

In the following description, reference will be made to the accompanyingdrawings forming part hereof and in which: Fig.1 is a side view partlyin section of a machine embodying features of the invention;

. Fig. '2 is a top or plan view of the same;

Fig. 3 is a side elevational view drawn to a reduced scale and lookingfrom the top of the sheet toward the bottom in Fig.2;

Fig. 4 is a face view of a strip of metal or blade to be bentinto spiralform;

Fig. 5 is a view of the same bent into curved form;

Fig. 6 is a view of the strip shown in Fig. 5 twisted into spiral form;

2 as detachably connected with the housing I so that diiferent dies maybe employed. The cavity through the die is of twisted form asillustrated in Figs. 10 to '13.

At the entrance of the die are two pairs of in and l l are mounted in asleeve detachably arranged in the die holder. The bite between the rollsIn is aligned with the entrance to the 'avity in. the die.

The mode of operation of the machine may be described as follows.

A straight strip of metal a as shown in Figs. 4 and 7 is fed to themachine Fig. 7 is a transverse sectional view of the strip Fig. 8 is asectional view taken on the line 8-8 of Fig. 1 and showing the feedrolls;

Fig. 9 is an end view showing. the twisting rolls;

Fig. 10 is a detached elevational view of the die;

Fig. 11 is a view of the die shown in Fig. 10;

Fig. 12 is a view of the right-hand end of the die shown in Fig. 10; and

Fig. 13 is a, view of one-half of the die shown in Fig. 10.

left-hand end of the Referring to the drawings, the invention will bedescribed in connection with the manufac-' ture of spiral blades forlawn mowers but the machine of the invention is applicable to other usesand purposes. I indicates a frame or housing. Mounted on one face of theframe or housing are sizing and feed rolls 2. These rolls are ofsubstantially the same diameter and are grooved and iournaled to theex'act dimensions of the finished blade or strip and they are positivelydriven by means of the gear wheels 3. 4, 5 and Ii are bending rolls ofwhich roll 4 is driven by gear wheel I. The roll 4 is of larger diameterthan the rolls 5 and 6 which are of the same diam The rolls 5 and 6 arespaced apart and are shown as peripherally grooved. The roll 6 is alsoshown as peripherally grooved. 8 is a drive shaft for driving thevarious gears which are arranged on the other face of the housing. 9 isa die shown and, in passing betweenthe grooved sizing and feed rolls 2,any slight irregularity in dimension is corrected and the strip is fedforward. In passing between the bending rolls 4, 5 and 6, the strip isbent into curved form as shown in Fig. 5. In passing through thetwisting rolls' I0 and II, the strip assumes spiral form as shown inFig. 6; and, in passing through the die, any irregularityinthe spiralform of the strip is corrected.

It will, of course, be understood that the strip may be fed to themachine in sections and each following section pushes the section aheadof it through the machine.

It will be obvious to those skilled in the art that modifications may bemade in details of construction and arrangement and procedure witha outdeparting from the spirit of. the invention which is not limited as tosuch matters or otherwise than the appended claims may require.

-I claim: I

1. In a machine of the type recited, the combination of, a pair ofperipherally grooved sizing and feeding rolls, a set of three bendingrolls, two pairs of twisting rolls of which the axes are inclined inrespect to the axes of the other rolls, a spiral die arranged inprogression, and means for driving the sizing and feeding rolls.

2. In a machine of the type recited, the combination of, a pair of feedrolls, a set of three bending rolls of which two are of substantiallythe same diameter and the third is of greater diameter, two pairs oftwisting rolls of which the axes are inclined in respect to the axes ofthe other dies, a spiral die, and means for driving ing roll of largestdiameter.

a" 3. In a. machine of the type recited, the combinatlon of, ahousing, apair of peripherally grooved feed rolls, a set of three bending rolls ofwhich one is of larger diameter than the other, two pairs of twistingrolls of which the axes are inclined in respect to the axes of the otherrolls, all of said rolls arranged at one face of the housing, a spiraldie detachably connected with one end of the housing and aligned withsaid rolls, and means arranged on the other face of the housing fordriving each pair of feed rolls and for driving the bending roll oflargest diameter.

' F. H. BRAUN.

